My wife's Ford Fiesta (X-reg) has a horrible rattle coming from behind the dash (front passenger side) like something is lose behind it and gets worst the faster you drive the vehicle.

I think a piece of the air flow system is loose as it sounds like something plastic is rattling.

The problem is finding out what the noise is!

There is the air bag plate on the front of the dash just above the glove box ( although there is no air bag on this model ). Can this be removed to have a look?

Or does the whole dash need to be taken off? Hopefully you or someone knows the answer.